GB1425756A - Electro-optic picture display and memory device - Google Patents
Electro-optic picture display and memory deviceInfo
- Publication number
- GB1425756A GB1425756A GB3279373A GB3279373A GB1425756A GB 1425756 A GB1425756 A GB 1425756A GB 3279373 A GB3279373 A GB 3279373A GB 3279373 A GB3279373 A GB 3279373A GB 1425756 A GB1425756 A GB 1425756A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- quasi
- ferroelectric
- lenses
- radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 abstract 3
- 230000005855 radiation Effects 0.000 abstract 3
- 239000011159 matrix material Substances 0.000 abstract 2
- 230000005621 ferroelectricity Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/055—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect the active material being a ceramic
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
- G11C13/047—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using electro-optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
- H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
- H01G7/025—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric
- H01G7/026—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric with ceramic dielectric
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Inorganic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optical Recording Or Reproduction (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
1425756 Matrix displays PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 10 July 1973 [13 July 1972] 32793/73 Heading G5C [Also in Divisions H3-H5] Information represented by electrical pulses is stored in discrete charge regions of a transparent quasi-ferroelectric plate, and the consequential birefringent changes are detected for information read-out by polarized optical radiation, the quasi-ferroelectric material having the property of storing a pulse applied to a pair of surface electrodes for a prolonged charge period provided the electrodes are isolated from the pulse source before the pulse terminates, while stored information is erasable at any time by short circuiting the electrodes. Quasiferroelectric behaviour is also known as field induced ferroelectricity and is obtainable in the composition (Pb 1-1À5y La y )(Zr x Ti 1-x )O 3 , where x and y lie in a rectangular system of co-ordinates. A range of values for x and y is given, Fig. 4 (not shown), a preferred composition having the values of x=0À65, y=0À09. A quasi-ferroelectric test plate 1 is shown in Fig. 5, which comprises four earthed electrodes 3-6 and a common electrode 2 connected to a pulse source together defining four discrete charge storage regions 7-10. A test system for optical measurements is shown in Fig. 6, which uses a quasi-ferroelectric plate 22 with electrodes 11-16 on both major surfaces, the charge storage state of a region being determined by 6328 A radiation 18 from a HeNe laser 17 which passes through a polarizer 19 and an analyser 20 to a detector or screen 21. An electrode structure providing eight separately controlled storage regions is shown in Fig. 7. Alternatively a matrix structure of electrodes may be used, Fig. 9 (not shown). An optical system for a picture display is shown in Fig. 8a, radiation from a HeNe laser 33 being adjusted by lenses 35, 36 to an enlarged collimated beam before passing through a polarizer 38, the ferroelectric plate 23 and an analyser 39. Lenses 40 and 41 further enlarge the beam for projection to a screen 42. In a modification, Fig. 8b, lenses 43 and 44 together form a projection system.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722234455 DE2234455A1 (en) | 1972-07-13 | 1972-07-13 | ELECTRO-OPTICAL IMAGE PLAYBACK AND STORAGE DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1425756A true GB1425756A (en) | 1976-02-18 |
Family
ID=5850567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3279373A Expired GB1425756A (en) | 1972-07-13 | 1973-07-10 | Electro-optic picture display and memory device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS4946444A (en) |
| CA (1) | CA1006264A (en) |
| DE (1) | DE2234455A1 (en) |
| FR (1) | FR2193230B1 (en) |
| GB (1) | GB1425756A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3882269A (en) * | 1973-05-11 | 1975-05-06 | Scripps Co E W | Apparatus, system and method of storing a static image displayed on a television tube |
| GB1516675A (en) * | 1975-06-09 | 1978-07-05 | Mullard Ltd | Electro-optic devices |
| US4158201A (en) * | 1977-10-18 | 1979-06-12 | The Singer Company | Flat electro optic display panel and method of using same |
-
1972
- 1972-07-13 DE DE19722234455 patent/DE2234455A1/en active Pending
-
1973
- 1973-07-06 CA CA175,891A patent/CA1006264A/en not_active Expired
- 1973-07-10 GB GB3279373A patent/GB1425756A/en not_active Expired
- 1973-07-10 JP JP48077163A patent/JPS4946444A/ja active Pending
- 1973-07-11 FR FR7325378A patent/FR2193230B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2234455A1 (en) | 1974-01-24 |
| JPS4946444A (en) | 1974-05-04 |
| FR2193230A1 (en) | 1974-02-15 |
| CA1006264A (en) | 1977-03-01 |
| FR2193230B1 (en) | 1976-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |